public class Main {
    public static void main(String[] args) {
        a();
        System.out.println("a函数出栈");
    }
    public static void a(){
        System.out.println("a函数入栈");
        b();
        System.out.println("a函数出栈");

    }
    public static void b(){
        System.out.println("b函数入栈");
        c();
        System.out.println("b函数出栈");
    }
    public static void c(){
        System.out.println("c函数入栈");
        System.out.println("c函数出栈");
    }
}
